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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

9.3K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
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Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Related Experiment Video

Updated: Apr 26, 2026

Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation
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Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation

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Electrocardiographic left ventricular strain pattern: everything old is new again.

Douglas D Schocken1

  • 1Division of Cardiology, Duke University School of Medicine, Durham, NC, USA.

Journal of Electrocardiology
|July 20, 2014
PubMed
Summary

The electrocardiographic left ventricular (LV) strain pattern, a feature of LVH, is linked to poor cardiovascular outcomes. Its regression with blood pressure lowering doesn't mean reduced LV mass, highlighting its potential as a distinct biomarker.

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High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
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Evaluation of Left Ventricular Structure and Function using 3D Echocardiography
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Related Experiment Videos

Last Updated: Apr 26, 2026

Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation
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High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
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Evaluation of Left Ventricular Structure and Function using 3D Echocardiography
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Evaluation of Left Ventricular Structure and Function using 3D Echocardiography

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Electrocardiographic left ventricular hypertrophy (LVH) presents with diverse features beyond standard voltage and duration criteria.
  • The left ventricular (LV) strain pattern, characterized by specific ST-T wave changes, is associated with increased systemic blood pressure.

Purpose of the Study:

  • To explore the significance of the LV strain pattern in electrocardiography.
  • To differentiate the LV strain pattern from ischemic ST-T wave changes.
  • To investigate the prognostic value and therapeutic implications of the LV strain pattern.

Main Methods:

  • Analysis of electrocardiographic data, focusing on QRS voltage, duration, and ST-T wave morphology.
  • Review of population studies correlating LV strain pattern with cardiovascular outcomes.
  • Observation of LV strain pattern changes during antihypertensive therapy trials.

Main Results:

  • The LV strain pattern, distinct from ischemia, is associated with poor prognosis and increased adverse cardiovascular events.
  • Regression of the LV strain pattern during antihypertensive treatment parallels blood pressure decline but not LV mass reduction.
  • Electrical remodeling, indicated by LVH with repolarization abnormalities, may be managed using the LV strain pattern as a biomarker.

Conclusions:

  • The LV strain pattern is a significant electrocardiographic finding with prognostic implications in LVH.
  • Further research using advanced data processing may elucidate the role of the LV strain pattern in cardiovascular risk management.
  • The LV strain pattern represents a potential electrocardiographic biomarker for cardiovascular risk stratification.